Updated compiler pass to always use the config key in service IDs

This allows for instance to set different namespaces depending on the environment; useful when using different environments on the same server.

i.e:
```yaml
liip_doctrine_cache:
    namespaces:
        feed:
            namespace: "feed_%kernel.environment%"
            type: %cache.type%
            port: %cache.port%
            host: %cache.host%
```